One of the 1st rules of thumb with growing is PATIENCE

These plants require alot of it,trust me.the whole way through.depending on the strain,manipulating the plant can make it turn male or female,or both!!they are very hearty and resiliant,but if you mess with them too much,too soon, they may react in a bad way.remember that! To take clones from a plant with unknown sex is foolish and could be a waste of time.If the clones even survive.I would take one clone put it into 12/12 light and keep watching for sex.or try the covering one branch for 12 hrs a day like i stated earlier,then you dont have to wait to see if the clone you take is even gonna live.If you dont do everything right when cutting a clone.IT WILL DIE.then your getting no where fast.Plants will usually show pre-flowers when maturity is reached,usually around 6-8 weeks old.again,depending on strain.patience my friend patience.